Post Utme Chemistry Past Questions and Answers

Question 21:

The process of changing one element into another is called ____________

A. Radioisotope
B. Radioactivity
C. Dating
D. Transmutation
E. Nuclear reaction

Question 22:

The shapes of \(\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}\) and \(\mathrm{CH}_{4}\) respectively are ____________

A. Bent, linear and tetrahedral
B. Bent, tetrahedral and linear
C. Tetrahedral, linear and bent
D. Linear, bent and tetrahedral

Question 23:

This compound exhibits ionic bonding ____________

A. \(\mathrm{H}_{2} \mathrm{O}\)
B. \(\mathrm{H}_{2}\)
C. \(\mathrm{KCl}\)
D. \(\mathrm{NH}_{3}\)
E. \(\mathrm{HF}\)

Question 24:

This type of bonding involves overlapping of orbitals during which electrons are shared ____________

A. Hydrogen bonding
B. Covalent bonding
C. Ionic bonding
D. Metallic bonding
E. Van-derwaals bonding

Question 25:

Which one of the following changes is physical?

A. Adding iron filings to aerated water
B. Adding sodium metal to water
C. Cooling a solution of iron(II) sulphate to obtain the hydrated salt
D. Cooling water to obtain ice